railway RRB Technician Grade 3 Mock Test 2024 General Science Chemistry Chemical Bond and Molecular Structure

उष्णता ऊर्जा निर्माण करण्यासाठी जाळलेल्या पदार्थांना काय नाव दिले जाते?

1
बायोमटेरियल्स
2
इंधन
3
रसायने
4
वायू
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